Income taxes (Effective Tax Rate) (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Reconciliation between federal statutory tax rate and effective tax rate
U.S. federal statutory rate	21.00%	28.00%	35.00%	35.00%
State and local income taxes, net of federal benefit		(6.10%)	(1.70%)	0.30%
Foreign tax rates, net of valuation allowances		(23.50%)	(23.50%)	(12.70%)
Establishment/(release) of valuation allowance, net of U.S. tax expense		(0.10%)	1.30%	(1.70%)
Change in contingency reserves		(7.40%)	3.60%	(2.50%)
Tax audit settlements		4.50%	0.10%	(0.70%)
Impact of the Act - transition tax		158.50%
Impact of the Act - deferred tax effects		4.20%
Goodwill impairment		35.10%
Other, net		5.30%	0.40%	0.50%
Effective Income Tax Rate - continuing operations		198.50%	15.20%	18.20%
Tax benefit due to lower tax jurisdictions		$ (34.1)